Tue Nov 20 00:50:07
Fifty is the smallest number that is the sum of two non-zero square numbers in two distinct ways: 50 = 12 + 72 = 52 + 52. It is also the sum of three squares, 50 = 32 + 42 + 52, and the sum of four squares, 50 = 62 + 32 + 22 + 12. It is a Harshad number.

There is no solution to the equation φ(x) = 50, making 50 a nontotient. Nor is there a solution to the equation x − φ(x) = 50, making 50 a noncototient.

tumbleweed
the wanderer

Tue Nov 20 00:51:32
...some of those 2's are exponents

Cherub Cow
Member

Tue Nov 20 00:57:57
"...some of those 2's are exponents"

Oh, good! I was seriously confused and wondering if I was looking at some upper-level math where normal rules do not apply :D